Preprints
https://doi.org/10.5194/acp-2021-658
https://doi.org/10.5194/acp-2021-658

  24 Sep 2021

24 Sep 2021

Review status: this preprint is currently under review for the journal ACP.

Influence of the Change in Total Ozone Column (TOC) on the Occurrence of Tropospheric Ozone Depletion Events (ODEs) in the Antarctic

Le Cao1,, Linjie Fan1,2,, Simeng Li1, and Shuangyan Yang2 Le Cao et al.
  • 1Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science and Technology, Nanjing 210044, China
  • 2Key Laboratory of Meteorological Disaster, Ministry of Education (KLME)/Joint International Research Laboratory of Climate and Environmental Change (ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD), Nanjing University of Information Science and Technology, Nanjing 210044, China
  • These authors contributed equally to this work.

Abstract. The occurrence of the tropospheric ozone depletion events (ODEs) in the Antarctic can be influenced by the change in Total Ozone Column (TOC). In this study, we combined the observational data obtained from ground observation stations with two numerical models (TUV and KINAL), to figure out the relationship between the TOC change and the occurrence of ODEs in the Antarctic. A sensitivity analysis was also performed on the change in ozone and major bromine species (BrO, HOBr and HBr) to find out key photolysis reactions determining the impact on the occurrence of tropospheric ODEs brought by the change in TOC. From the analysis of the observational data and the numerical results, we suggested that the occurrence frequency of ODEs in the Antarctic seems negatively correlated with the variation of TOC. Moreover, major ODE accelerating reactions (i.e. photolysis of ozone, H2O2 and HCHO) and decelerating reactions (i.e. photolysis of BrO and HOBr), which heavily control the start of ODEs, were also identified. It was found that when TOC varies, the major ODE accelerating reactions speed up significantly, while major ODE decelerating reactions are only slightly affected, thus leading to the negative dependence of the ODE occurrence on the change in TOC.

Le Cao et al.

Status: open (until 21 Nov 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse

Le Cao et al.

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Short summary
We combined the observational data with models, to figure out the impact on the occurrence of tropospheric ODEs in the Antarctic caused by the change in the total ozone amount. The results suggest that the decrease of TOC favors the occurrence of ODEs. When TOC changes, the rates of major ODE accelerating reactions are substantially altered, while the rates of major ODE decelerating reactions remain unchanged, leading to the negative association between the TOC change and the occurrence of ODEs.
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